The antonyms for the phrase "rise occasion" largely depend on the context in which it is used. In general, the antonyms for rise could be fall or decrease, while the antonyms for occasion could be prevent or avoid. Thus, depending on the situation, some appropriate antonyms for the phrase rise occasion could be: fall short, prevent opportunity, avoid occasion, decrease chance, or miss the opportunity. For instance, if a business doesn't plan well, it may fall short of the rise occasion. Similarly, if an individual takes sufficient precautions, they can avoid the occasion of rising danger.